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Mr Jeff Wong
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<br /> tArgon Laboratories analyzed all groundwater samples collected for total petroleum hydrocarbons as
<br /> gasoline (TPHg) using EPA 801513, benzene, toluene, ethylbenzene, and total xylenes (BTEX) using
<br /> EPA 8021B, and oxygenated gasoline additives, ethylene dibromide (EDB) and 1,2-dichloroethane
<br /> (1,2-DCA) using EPA 8260B
<br /> No gasoline constituents were detected in the groundwater samples collected from wells MW7, MWS,
<br />' MW9B, MW 10, MW 11, or MW 14B in March 2004
<br /> 1 TPHg and BTEX constituents were detected in groundwater samples collected from wells MW1,
<br /> MW2, MW12, and VW1 in March 2004 Well MWi contained TPHg at 25,000 parts per billion
<br /> (ppb), benzene at 3,300 ppb, toluene at 3,900 ppb, ethylbenzene at 180 ppb, and xylenes at 1,300 ppb
<br />' Well MW2 contained TPHg at 390 ppb, benzene at 2 3 ppb, ethylbenzene at 1 9 ppb, and xylenes at
<br /> 8 1 ppb Well MW 12 contained xylenes at 2 1 ppb Well V W 1 contained TPHg at 7,200 ppb,
<br /> benzene at 990 ppb,toluene at 620 ppb, ethylbenzene at 150 ppb, and xylenes at 620 ppb
<br />' MTBE was present in wells MW 1, MW2, MW3, MW4, MW5, MW6, MW 12, MW13C, and VW1 at
<br /> concentrations of 6,200 ppb, 390 ppb, 3,000 ppb, 9,100 ppb, 96 ppb, 14 ppb, 1,500 ppb, 110 ppb, and
<br />' 4,900 ppb, respectively No MTBE was detected in samples collected from wells MW7, MW8,
<br /> MW913, MW10, MW11, or MW14B
<br />' Table 5 summarizes groundwater analytical results Figures 3 and 4 present isoconcentration maps
<br /> of MTBE and benzene in the A Zone, respectively Attachment D contains Iaboratory reports and
<br /> chain-of-custody documentation for groundwater samples collected from wells MW2 through
<br />' MW13C and VWI in March 2004 Attachment E contains graphs of TPHg, benzene, and MTBE
<br /> concentrations of over time in all site wells
<br />' 3.3 Domestic Well Sampling and Analysis
<br /> At the request of EHD, Ground Zero collected water samples from eight nearby domestic wells,
<br /> including the site facility well The samples were collected from either a sample port at the wellhead
<br /> or from the nearest available sampling location (i a garden hose) Samples were collected after the
<br /> pump was turned on for approximately 15 minutes The samples were immediately stored in an ice
<br /> chest refrigerated to a temperature of approximately 4°C and delivered under chain of custody protocol
<br /> to FGL Laboratories (ELAP #1563) and analyzed for volatile organic constituents utilizing EPA
<br /> Method 524 2 No VOCs were detected in any of the samples collected from the nearby domestic
<br />' wells Copies of the laboratory reports were submitted to each property owner separately and a copy
<br /> was sent to Mr Jeff Wong of EHD
<br /> 4.0 SUMMARY
<br /> The groundwater treatment system was put into operation on November 5, 2003 pursuant to WDR
<br /> General Order No R5-2003-004412 The system generally operated continuously during the reporting
<br /> period (January through March 2004) The average flow rate during the reporting period was 1 3 gpm
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